Pronunciation

change

Singular
diamond

Plural
diamonds

 
A diamond gem
 
The four playing card suits with the diamonds on the bottom left
  1. (uncountable) Diamond is a very hard mineral made from carbon that is shiny like glass.
    The blades of cutting tools like saws and knives are sometimes coated in diamond.
  2. (countable) A diamond is a precious gemstone made from the mineral diamond.
    The diamond is the birthstone of April.
  3. (countable), (geometry) In geometry, a diamond is a rhombus shape, especially one that is taller than it is wide; .
  4. (plural) In card games, the diamonds are one of the four playing card suits.
    The diamonds and the hearts are the two red-colored suits.
  5. (countable) In cards games, a diamond is a card of the diamond suit.
    I have three diamonds in my hand.
Suits
       
hearts diamonds spades clubs